condition mean min max ZT0-3 1051.976647 1051.976647 1051.976647 ZT4-7 1031.6021245000002 1031.6021245000002 1031.6021245000002 ZT8-11 1274.7389555 1274.7389555 1274.7389555 ZT12-15 1419.4786385 1419.4786385 1419.4786385 ZT16-19 914.5204615 914.5204615 914.5204615 ZT20-23 959.1406695000001 959.1406695000001 959.1406695000001